It's taken longer than usual for the Construction Industry Research Board in Sacramento to calculate the annual building permit totals for California's 58 counties and 538 cities.

For the first time, the board is adding up a separate category for accessory dwelling units (ADUs), also known as Granny Flats.

The results in San Diego County reveal a huge increase in housing construction last year, with a total of nearly 12,000 building permits, a 21% increase over 2022 and the biggest building spree in 17 years, the San Diego Union-Tribune reported.

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